Any form of reaction from a action, it could be how a ball bounces when you drop or throw it or how someone reacted when you said something to them. I can't even begin to list the amount of replies that could be generated from this.

Edit: or even how you reacted to something or someone it can be just about anything. Just what comes to mind is what I was saying.

Karma could be one way of seeing it although that wasn't what I was originally getting at. I was just saying for instance a response from anything that you see, do or something, or someone else does as a reaction to a action.

Edit: It could be anything from throwing a dog a ball and watching the dog return it or stare at it, or from greeting a family member or significant other and them returning it with a greeting or smile. Even watching a drop of water from a leaking faucet burst as it hits the ground.

Reminds me of the time in middle school when the science teacher was bringing that up, I punched the girl next to me in the shoulder and she punched me right back and the teacher was like "WTF R U DOING?" and I was like "Proving Newton's Law"

Nonononon throwing the ball and having it fly away from you is an action/reaction, the ball being returned by a dog is a separate set of actions/reactions. After all the universe isn't broken when the dog don't return the ball.

I think of the saying there can be no good without evil, and i think of everyday situations, like the girls ive been sleeping with told me she has a boyfriend, i am now not speaking with her anymore, it applies all over the place